/Engine/Source/Editor/UnrealEd/Public/HierarchicalLOD.h
Get the list of mesh packages to save for a given level
void GetMeshesPackagesToSave ( [ULevel](API\Runtime\Engine\Engine\ULevel) * InLevel, [TSet](API\Runtime\Core\Containers\TSet)< [UPackage](API\Runtime\CoreUObject\UObject\UPackage) * > & InHLODPackagesToSave, const [FString](API\Runtime\Core\Containers\FString) & PreviousLevelName )